1. Brief Overview on Packet Transport Network (PTN)
Presenter: Er. Subash Chandra Pakhrin (7424) Backbone Transmission Directorate Babarmahal, Kathmandu
1/3/2019

2. What is PTN PTN is a hybrid technology that supports E1 + IP services.
It works on the MPLS – TP (Multiprotocol Label Switching – Transport Protocol)
It supports PWE3 (Pseudo Wire Emulation Edge to Edge Technology)
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3. How is a PTN Hybrid Technology ?
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4. Where does MPLS – TP lie in Open System Interconnect (OSI) Model
MPLS – TP lie somewhere in layer 2.75
In layer 2 we get the essence of VLAN and MAC address
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5. Difference between MSTP and PTN
MSTP (Multiple Switching Transport Protocol) is mainly oriented for TDM
PTN presents advantages when packet service is predominant.
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6. What is MAC address Media Access Control (MAC)
Its unique identification number for each equipment.
Its 48 bit in length.
Each equipment has unique MAC address
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7. What is VLAN Virtual LAN We have 2^12 = 4096 VLANS
Among them we use VLANS from 16 to 4000 other VLANS are used for some special purpose.
Segregation Technique that helps to fragment IP – V4 address.
Can we purchase some public IP – V4 address ????
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8. Tunnel, Pseudo wire, Ethernet, TDM
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9. Services Provided by PTN
STM1 Services
In 1-STM1 we have 63 E1.
PTN is so beautiful and so lucid that it uses simple nomenclature in the flipside other equipment uses K – L – M nomenclature.
E1 Services
IP services
E-Line / VPWS / Point to Point
E – Tree / VPLS / Point to Multipoint
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10. E – Line and E - Tree
E – Line
E - Tree
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11. Bandwidth supported by PTN
10 G optical port for line card (NNI – Network Network Interface).
1G optical port for line / user card (NNI / UNI user network interface).
100Mbos Electrical port
100Mbps Optical port
STM1 optical port E1
## STM4 optical card under test
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12. We will meet in successive class very soon. Thank You.
Any Questions ?
We will meet in successive class very soon. Thank You.
1/3/2019